At what time post-delivery is tachypnea typically observed in newborns?

Tachypnea in newborns, often characterized by rapid breathing, is typically observed within the first few hours after delivery. Specifically, it is most common around the six-hour mark. This timing aligns with the period known as "transitional physiology," where the newborn is adapting to extrauterine life. During this initial phase, the infant's respiratory system is still adjusting after the stress of birth, which can lead to transient tachypnea.

Additionally, this condition is often linked to retained lung fluid or an immature respiratory system. The observation of tachypnea can be crucial as it may signify further complications if it persists or worsens beyond this timeframe. Understanding the typical onset time allows healthcare providers to monitor newborns effectively and intervene if necessary.